99 S10 vacuum issue wont start

I have a 99 s10. It died while driving. It will only start with the vacuum line disconnected to the brake booster. If you plug the intake where it hooks to the throttle body it dies. If you re atach the vacuum line it dies. With the line off it runs fine. It starts great and easily. It's a 4cyl, with only 110k miles. Any ideas.
Thanks

I would check for vacuum leaks and IAC valve and pcv valve.
MT

I did find a vacuum line that was bad. I'll replace that and check all the others. Thanks for the help and I'll let you know what happens.
t-andj